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A disk of radius 2.3 cm has a surface charge density of 6.2 µC/m2 on its upper face. What is the magnitude of the electric field produced by the disk at a point on its central axis at distance z = 12 cm from the disk? N/C.
Estimate the kinetic energy of the Mars with respect to the Sun as the sum of the teerms, that sue to its daily rotation about its axis
Two 27.0 cm focal-length converging lenses are placed 16.5 cm apart. Where will the final image formed by the second lens be located
An 800 g ball moves in a vertical circle on a 1.07-m-long string. If the speed at the top is 5-m/s, after that the speed at the bottom would be 8.18 m/s.
A projectile is fired at an upward angle of 50° from the top of a 145m cliff with a speed of 195 m/s. What will be its speed while it strikes the ground below? (Use conservation of energy.)
A 50-g block of copper at -15?C is added to 100g of water in a 71-g aluminum cup. The cup and the water have an initial temperature of 4.0?C. Find the equilibrium temperature of the cup
a u-tube contains mercury with a density of 13,600 kg/m^3. it is open on one end, and the other end is connected to a boiler, what is the gauge pressure at point A in the boiler
Guess scale factor of the Universe
A steel wire is used to stretch a spring. An oscillating magnetic field drives the steel wire back and forth. what stretch of the spring produces a standing wave with six nodes
The windpipe of a typical whooping crane is about 4.5 ft long. What is the lowest resonant frequency of this pipe, assuming that it is closed at one end
A very thin sheet of glass (n=1.5) floats on the surface of water (n=1.33). When illuminated with white light at normal incidence, What is the thickness of the glass
First-order Bragg diffraction is observed at 23.0 degrees relative to the crystal surface, with spacing between atoms of 0.26nm, At what angle will second order be observed
The sun is 30 degrees above the horizon. It makes a 48 meter long shadow of a tall tree. How high is the tree
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